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University of Houston
1.
Appanapalli, Sridhar Reddy.
Organic & Polymer-based Lithium Ion Batteries.
Degree: MS, Mechanical Engineering, 2012, University of Houston
URL: http://hdl.handle.net/10657/772 
► Polymer-based electrode and electrolyte components can pave the way for safe and flexible Lithium ion batteries. A total plastic battery requires an electrolyte layer to…
(more)
▼ Polymer-based electrode and electrolyte components can pave the way for safe and flexible Lithium ion batteries. A total plastic battery requires an electrolyte layer to be sandwiched between thin polymer layers. Polymer components offer significant advantages including enhanced safety, stability and thin film manufacturability.
In this study, we investigate the fabrication, assembly and characterization of organic and polymer based Lithium ion batteries. Specifically, we used PEO (Polyethylene oxide) for electrolyte. We used polymers PVBPT and PTMA for electrodes and utilized organic fillers and binders to improve the electrical conductivity of the polymer. These polymers work as electrode by releasing or collecting electron from Li through their radical polymer chain during charge and discharge. A flexible battery was prepared using conventional electrode and polymer electrolyte. Conventional coin cells with standard electrode and electrolyte materials were also assembled and tested for comparison. Cyclic voltammetry, electrochemical impedance spectroscopy and SEM are included.
Advisors/Committee Members: Ardebili, Haleh (advisor), Rao, Jagannatha R. (committee member), Jacobson, Allan J. (committee member).
Subjects/Keywords: Polymers; Cyclic voltammetry; Mechanical engineering
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APA (6th Edition):
Appanapalli, S. R. (2012). Organic & Polymer-based Lithium Ion Batteries. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/772
Chicago Manual of Style (16th Edition):
Appanapalli, Sridhar Reddy. “Organic & Polymer-based Lithium Ion Batteries.” 2012. Masters Thesis, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/772.
MLA Handbook (7th Edition):
Appanapalli, Sridhar Reddy. “Organic & Polymer-based Lithium Ion Batteries.” 2012. Web. 24 Jan 2021.
Vancouver:
Appanapalli SR. Organic & Polymer-based Lithium Ion Batteries. [Internet] [Masters thesis]. University of Houston; 2012. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/772.
Council of Science Editors:
Appanapalli SR. Organic & Polymer-based Lithium Ion Batteries. [Masters Thesis]. University of Houston; 2012. Available from: http://hdl.handle.net/10657/772
University of Houston
2.
Rifenburgh, William McKenzie.
Fluid Actuation for Imaging Compatible Devices.
Degree: MS, Aerospace Engineering, 2014, University of Houston
URL: http://hdl.handle.net/10657/1205
► The use of robots in imaging devices is becoming more prominent with the development of image guided surgery robots and imaging related research requiring mechanical…
(more)
▼ The use of robots in imaging devices is becoming more prominent with the
development of image guided surgery robots and imaging related research
requiring mechanical actuation. Many such robotic systems exist today but
unfortunately cause imaging distortion and artifacts due to the presence of
actuators and control electronics that are incompatible with the imaging devices
used. One solution to this problem is the use of fluid actuators. Fluid actuators
can be made entirely of polymers that are fully compatible with both MRI and CT
scanning. In the course of this work, the modeling, identification and control of
hydraulic and pneumatic linear piston-cylinder actuators was investigated and a
performance comparison of the two types of actuation in various medical robotics
applications was made. The results show that hydraulic systems are better suited
for precise positioning tasks and haptic force-feedback teleoperation and
pneumatic systems are better suited for applications requiring compliant motion.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Rao, Jagannatha R. (committee member), Garbey, Marc (committee member).
Subjects/Keywords: Pneumatics; Hydraulics; Robotics; Teleoperation; Medicine
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APA (6th Edition):
Rifenburgh, W. M. (2014). Fluid Actuation for Imaging Compatible Devices. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1205
Chicago Manual of Style (16th Edition):
Rifenburgh, William McKenzie. “Fluid Actuation for Imaging Compatible Devices.” 2014. Masters Thesis, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/1205.
MLA Handbook (7th Edition):
Rifenburgh, William McKenzie. “Fluid Actuation for Imaging Compatible Devices.” 2014. Web. 24 Jan 2021.
Vancouver:
Rifenburgh WM. Fluid Actuation for Imaging Compatible Devices. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/1205.
Council of Science Editors:
Rifenburgh WM. Fluid Actuation for Imaging Compatible Devices. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1205
University of Houston
3.
Nallapu, Raviteja 1989-.
Orbit Propagation via MRQ Sphere Technique.
Degree: MS, Aerospace Engineering, 2012, University of Houston
URL: http://hdl.handle.net/10657/765
► The Multi-Resolution Quadrature (MRQ) Sphere model, is a newly developed multi- resolution gravity model designed to estimate the gravity fields of arbitrary shaped space bodies,…
(more)
▼ The Multi-Resolution Quadrature (MRQ) Sphere model, is a newly developed multi- resolution gravity model designed to estimate the gravity fields of arbitrary
shaped space bodies, such as asteroids. The MRQ Sphere model uses two recently developed mathematical techniques to approximate the standard spherical harmonics. One of these tools approximates the radial decay terms using the sum of Gaussians,
while the other is used for estimating the angular functions on the nodes of the quadratures of a sphere. In this work, we apply the MRQ sphere technique to the
classic orbit propagation problem and compare the propagated orbit with that generated by the spherical harmonics method. We validate the methods with Earth as the primary body, and propagate the orbit of test cases such as the LAser GEOdynamics Satellite-II (LAGEOS-II) and the GPS BIIA-10 (PRN 32) satellite. We find that the MRQ-Sphere model may be applicable to orbit propagation up
to a user dependent approximation.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Provence, Robert S. (committee member), Rao, Jagannatha R. (committee member).
Subjects/Keywords: Orbit Propagation; Gravity Estimation; MRQ-Sphere; Spherical harmonics; LAGEOS-II; GPS BIIA-10; Cartesian Formulation; Kepplerian elements; Gravity Potential; Orbital Mechanics; Aerospace engineering
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APA (6th Edition):
Nallapu, R. 1. (2012). Orbit Propagation via MRQ Sphere Technique. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/765
Chicago Manual of Style (16th Edition):
Nallapu, Raviteja 1989-. “Orbit Propagation via MRQ Sphere Technique.” 2012. Masters Thesis, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/765.
MLA Handbook (7th Edition):
Nallapu, Raviteja 1989-. “Orbit Propagation via MRQ Sphere Technique.” 2012. Web. 24 Jan 2021.
Vancouver:
Nallapu R1. Orbit Propagation via MRQ Sphere Technique. [Internet] [Masters thesis]. University of Houston; 2012. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/765.
Council of Science Editors:
Nallapu R1. Orbit Propagation via MRQ Sphere Technique. [Masters Thesis]. University of Houston; 2012. Available from: http://hdl.handle.net/10657/765
University of Houston
4.
Ibekwe, Henry I. 1981-.
Decision-Making for Autonomous Systems in Partially Observable Environments.
Degree: PhD, Industrial Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1022
► Decision-making for autonomous systems acting in real world domains are complex and difficult to formalize. For instance, consider the task of autonomously navigating a mobile…
(more)
▼ Decision-making for autonomous systems acting in real world domains are complex and difficult to formalize. For instance, consider the task of autonomously navigating a mobile robot in an automated manufacturing facility. Its task is to transport hazardous material from a collection site to a disposal site. This is a navigation problem where the robot has to consider numerous variables such as collision avoidance, recognition of goal locations, accurate selection of the desired material, and knowledge of its location within the facility. The difficulty is often to reliably model the uncertainties and dynamics of the robot-environment interaction when the robot can only partially observe the states of the environment.
Therefore a principal problem in designing mobile robots that can efficiently navigate indoor domains to achieve a desired task autonomously is to construct robust models for efficient planning and motion control in stochastic domains. This is still a difficult and open problem despite significant advances. The robot must generate efficient policies to reliably accomplish its tasks while accounting for uncertainties in both its action and perception. In this dissertation we model the uncertainties in action selection and perception using a sequential decision-making model. The mathematical formalism adopted is the Partially Observable Markov Decision Process (POMDP), a generalization of the well-known Markov Decision Process (MDP). Though POMDPs represent a robust formalism for the modeling of agent-based decision making, it is still very difficult and often intractable to compute optimal solutions for problems with large state space due to the high dimensionality of the underlying belief space. We propose a technique called Goal-Specific Representation (GSR) that exploits domain structure and generates policies over a subset of the state space given a map of the domain, a starting location and a goal location. We solve the resulting POMDP model using a Point-Based Value Iteration (PBVI) solver and apply the generated policies for navigation on an autonomous robot. We anticipate that the results from this work can be applied in manufacturing facilities to enhance automation and healthcare domains for assisted care.
Advisors/Committee Members: Kamrani, Ali K. (advisor), Feng, Qianmei (committee member), Kundakcioglu, Erhun (committee member), Rao, Jagannatha R. (committee member), Wang, Keh-Han (committee member).
Subjects/Keywords: Decision-making; Autonomous Systems; Robotics; POMDPs; Partially Observable Environments; Robot Navigation; Goal-Specific Representation
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APA (6th Edition):
Ibekwe, H. I. 1. (2013). Decision-Making for Autonomous Systems in Partially Observable Environments. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1022
Chicago Manual of Style (16th Edition):
Ibekwe, Henry I 1981-. “Decision-Making for Autonomous Systems in Partially Observable Environments.” 2013. Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/1022.
MLA Handbook (7th Edition):
Ibekwe, Henry I 1981-. “Decision-Making for Autonomous Systems in Partially Observable Environments.” 2013. Web. 24 Jan 2021.
Vancouver:
Ibekwe HI1. Decision-Making for Autonomous Systems in Partially Observable Environments. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/1022.
Council of Science Editors:
Ibekwe HI1. Decision-Making for Autonomous Systems in Partially Observable Environments. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1022
University of Houston
5.
Ramezanifar, Amin 1981-.
Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.
Degree: PhD, Mechanical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1381
► In this dissertation we address a variety of problems in filtering and control of dynamic systems with emphasis on their digital implementation. We focus on…
(more)
▼ In this dissertation we address a variety of problems in filtering and control of dynamic systems with emphasis on their digital implementation. We focus on linear parameter varying (LPV) systems which have been widely utilized in engineering applications. LPV systems include a class of linear systems whose dynamic depends on time-varying parameters. These systems have resulted in significant improvements in the study of time-varying and nonlinear systems.
In a filtering problem, we aim to estimate the states of a dynamic system by utilizing the output measurement of the system. Applications of filters abound in practical and theoretical problems. In a control problem, the objective is to design a controller to ensure the closed-loop system stability and often to satisfy a prescribed level of performance. A main concern in the present study is the implementation of the controller or filter which is often fulfilled by means of a digital device operating in the discrete time domain. Due to the combination of the system continuous-time dynamics and the controller or filter discrete dynamics connected through analog to digital and digital to analog converter devices, the closed-loop system is a hybrid one and is difficult to analyze mathematically. The incorporation of continuous-time and discrete-time signals in a system is often referred to as sampled-data system. A particular difficulty in sampled-data systems is to ensure that the digital controller (filter) meets the design specifications in between the samples. In this dissertation, we develop new methods to take into account this requirement.
Two chapters of this dissertation are devoted to the design of filters for LPV systems. First, we design a continuous-time filter for a continuous-time state-delayed LPV system whose dynamics includes a time varying delay. Next, we address the sampled-data filter design problem for continuous-time LPV systems. In the second part of this dissertation, we investigate the control problem of LPV systems in the framework of sampled-data design. First we present a new approach for the sampled-data control of continuous-time LPV systems. Next, we extend the established results for LPV systems with internal delay.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Franchek, Matthew A. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member), Rao, Jagannatha R. (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Linear parameter varying (LPV) systems; Sampled-Data Filtering; Sampled-Data Control; Stability Analysis; Time Delay
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APA (6th Edition):
Ramezanifar, A. 1. (2013). Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1381
Chicago Manual of Style (16th Edition):
Ramezanifar, Amin 1981-. “Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.” 2013. Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/1381.
MLA Handbook (7th Edition):
Ramezanifar, Amin 1981-. “Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay.” 2013. Web. 24 Jan 2021.
Vancouver:
Ramezanifar A1. Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/1381.
Council of Science Editors:
Ramezanifar A1. Sampled-Data Filtering and Control of Linear Parameter Varying Systems with Delay. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1381
6.
Krishnaswamy, Ammani.
An Examination Of The Nature Of Science Presentation In High School Chemistry Textbooks Used In The United States and India.
Degree: EdD, Curriculum and Instruction, 2014, University of Houston
URL: http://hdl.handle.net/10657/1636
► The need for a scientifically literate society is essential to advance civilization and solve many global problems such as depletion of natural resources and carbon-based…
(more)
▼ The need for a scientifically literate society is essential to advance civilization and solve many global problems such as depletion of natural resources and carbon-based fuels, cure for life threatening ailments, famine, hunger, epidemics, and several other serious global problems. Scientific literacy is not restricted to factual knowledge of science but also extends to understanding science and how the scientific enterprise works (Clough, 2000). Therefore, learning about the “nature of science” has been considered as an important goal for both science teachers and students for more than 100 years.
Science textbooks play an important role in learning and delivering science content at all levels of science instruction (Lapointe, Mead, and Phillips, 1989; Stake and Easley, 1978; Weiss, 1993). This study sought to understand the extent to which science and the scientific enterprise (nature of science) have been represented in chemistry textbooks used in the United States and India. This cross-nation examination of science textbooks is important to the field of education and of science because textbooks serve as the principle teaching aids in science instruction in both countries.
Nature of science can be organized by four basic themes: science as a body of knowledge, science as a way of thinking, science as a way of investigating, and science and its interactions with society and technology (Chiapetta and Koballa, 2006). Further, an additional theme has been added: science and its interactions with engineering and technology. Together these five themes lead to the main question of the dissertation study: What is the balance of the selected five aspects of the nature of science (knowledge, thinking, investigating, interaction of science with society, interaction between science, engineering, and technology with society) that are evident in chemistry textbooks used in the United States and India? To address the research question, the content analysis methodology was used in this study. To establish reliability and validity of the coding instrument, a preliminary study was conducted. The study involved analyzing random sampling of pages within five chemistry textbooks from the United States and chemistry textbooks from grades 10, 11 and 12 from India.
The dissertation study involved the analysis of five samples related to topics that include acids and bases, biological chemistry, chemical reactions, hydrocarbons, and the periodic table from chemistry textbooks that are used in the United States and India. Coding procedures for analyzing the random sample involved two sets of coders. One of the coders had previously analyzed physical science textbooks with regard to the nature of science and ethnic diversity (Brooks, 2008). The researcher was the second coder and is a community college instructor with ten years’ experience of teaching chemistry at different grade levels. Both coders were trained to analyze the samples and the reliability of their coding checked before coding the chemistry textbooks. To check for…
Advisors/Committee Members: Chiappetta, Eugene L. (advisor), Watson, Margaret (committee member), Warner, Allen R. (committee member), Rao, Jagannatha R. (committee member).
Subjects/Keywords: Nature of Science; Chemistry; Textbooks
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APA (6th Edition):
Krishnaswamy, A. (2014). An Examination Of The Nature Of Science Presentation In High School Chemistry Textbooks Used In The United States and India. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1636
Chicago Manual of Style (16th Edition):
Krishnaswamy, Ammani. “An Examination Of The Nature Of Science Presentation In High School Chemistry Textbooks Used In The United States and India.” 2014. Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/1636.
MLA Handbook (7th Edition):
Krishnaswamy, Ammani. “An Examination Of The Nature Of Science Presentation In High School Chemistry Textbooks Used In The United States and India.” 2014. Web. 24 Jan 2021.
Vancouver:
Krishnaswamy A. An Examination Of The Nature Of Science Presentation In High School Chemistry Textbooks Used In The United States and India. [Internet] [Doctoral dissertation]. University of Houston; 2014. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/1636.
Council of Science Editors:
Krishnaswamy A. An Examination Of The Nature Of Science Presentation In High School Chemistry Textbooks Used In The United States and India. [Doctoral Dissertation]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1636
7.
Salimi, Amirhossein.
DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS.
Degree: PhD, Mechanical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/972
► Development of medical robots to assist with surgical operations has become an area of significant research interest for the past two decades. These robots are…
(more)
▼ Development of medical robots to assist with surgical operations has become an area of significant research interest for the past two decades. These robots are employed in a wide range of applications from prostate needle placement and kidney transplant to brain surgery and artery bypass. As new technologies are introduced and the development of more sophisticated and integrated robotic systems is made possible, more challenging operations are targeted to be enhanced using automated mechanisms.
Magnetic Resonance Imaging MRI-guided intracardiac intervention under beating-heart conditions is one of such sophisticated operations, which has attracted lots of attention recently. This dissertation focuses on the design, fabrication and control of an integrated robotic system that is aimed to assist with one specific procedure in this family-aortic valve implantation.
One of the challenges involved in cardiac interventions under beating-heart conditions is the disturbances generated by the blood flow patterns inside the heart. To address this issue, an analytic model is generated to predict the flow disturbance generated from the interaction between the blood flow and the surgical tool in the aortic valve replacement procedure.
The obtained model of external forces along with other design requirements initiate the development of a parallel structure platform to serve as a slave robot in the master-slave robotic configuration. Benefiting from the features of parallel mechanisms, this four degree-of-freedom (MRI)-compatible patient-mounted and cable-driven manipulator (that we named ROBOCATHETER) seeks to steer cardiac catheters under beating-heart conditions, while suitably addressing the decfiiencies that currently used manipulators vastly suffer from.
Following the implementation of a simple ON-OFF and a gain varying PID control schemes to evaluate the performance of the prototyped robot, as one of the main contributions of this dissertation, a gain-scheduling controller is designed and implemented to obtain the desired performance of the slave robot in tracking set points and reference trajectories.The performance of the controller is compared with the variable-gain proportionalderivative-integral (PID) controller. Experimental results show that the proposed control scheme has significant advantages in terms of set point tracking and actuator saturation over the baseline PID controller.
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Franchek, Matthew A. (committee member), Song, Gangbing (committee member), Rao, Jagannatha R. (committee member), Tsekos, Nikolaos V. (committee member).
Subjects/Keywords: MRI-compatible robotics; LPV controls; Mechanical engineering
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APA ·
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APA (6th Edition):
Salimi, A. (2013). DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/972
Chicago Manual of Style (16th Edition):
Salimi, Amirhossein. “DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS.” 2013. Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/972.
MLA Handbook (7th Edition):
Salimi, Amirhossein. “DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS.” 2013. Web. 24 Jan 2021.
Vancouver:
Salimi A. DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/972.
Council of Science Editors:
Salimi A. DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/972
University of Houston
8.
-9046-6880.
Evaluation of Relative Biological Effectiveness for Proton Therapy.
Degree: MS, Industrial Engineering, University of Houston
URL: http://hdl.handle.net/10657/3584
► Proton therapy for treating cancer patients has been evolved to become a highly desired choice of radiation therapy due to the physical characteristic of protons.…
(more)
▼ Proton therapy for treating cancer patients has been evolved to become a highly desired choice of radiation therapy due to the physical characteristic of protons. Currently, the biologic effectiveness of protons relative to photons is considered to be a constant ratio of 1.1. However, experiments show that the RBE is higher in different portions in proton ranges. Since the usage of a constant RBE is justified based on experiments conducted using older methods of dose delivery, the re-evaluation of using a constant RBE and proposing models for determining RBE values is necessary now that recent experimental results, using new actively scanned beam delivery method, are available and suggest deviations from conventional data. To suggest a method for calculating RBE values, an experiment by Guan et al. is chosen to derive biologic response results with respect to proton beams. A widely used phenomenological RBE model by Wilkens and Oeflke is chosen for comparison purposes. The proposed RBE model is based on Wilkens and Oeflke model with revisions on tissue parameters behavior vs. LET based on Guan et al results. Three RBE models including the constant RBE, Wilkens' model and the suggested model based on Guan’s experiment are compared for three brain cancer patient cases. The comparisons are demonstrated using cumulative RBE weighted dose volume histograms. The sensitivity of models to tissue parameter changes are also analyzed. The suggested model shows escalated variable RBE weighted dose compared to constant RBE weighted dose, and it is sensitive to RBE model parameters in all three patient studies.
Advisors/Committee Members: Lim, Gino J. (advisor), Cao, Wenhua (committee member), Rao, Jagannatha R. (committee member).
Subjects/Keywords: Proton Therapy; Variable Relative Biological Effectiveness
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APA (6th Edition):
-9046-6880. (n.d.). Evaluation of Relative Biological Effectiveness for Proton Therapy. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/3584
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Chicago Manual of Style (16th Edition):
-9046-6880. “Evaluation of Relative Biological Effectiveness for Proton Therapy.” Masters Thesis, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/3584.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
MLA Handbook (7th Edition):
-9046-6880. “Evaluation of Relative Biological Effectiveness for Proton Therapy.” Web. 24 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Vancouver:
-9046-6880. Evaluation of Relative Biological Effectiveness for Proton Therapy. [Internet] [Masters thesis]. University of Houston; [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/3584.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Council of Science Editors:
-9046-6880. Evaluation of Relative Biological Effectiveness for Proton Therapy. [Masters Thesis]. University of Houston; Available from: http://hdl.handle.net/10657/3584
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
University of Houston
9.
Kapur, Sunil 1988-.
Automatic First Break Detection by Spectral Decomposition Using Minimum Uncertainty Wavelets.
Degree: MS, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/2184
► Seismic Signal Processing can be effectively utilized to determine micro- seismic events. With the advances in hydraulic fracturing techniques, first break detection has become really…
(more)
▼ Seismic Signal Processing can be effectively utilized to determine micro- seismic events. With the advances in hydraulic fracturing techniques, first break detection has become really important in locating micro-seismic events. The measured data collected gathers far more information than can be extracted by human operators and whose interpretation can consume a lot of time. The transforma- tion in the computational efficiency suggests the involvement of computers in interpreting the measured data. We suggest a new method of first break detec- tion that is based on time-frequency spectral decomposition method and utilizes the Cn Transform and the Super-Gaussian μ wavelets. We tested our method on lab data with various signals and first arrival time was determined. The results were compared to the manual detection and our method had an accuracy of 0.6 μ seconds. The results indicate that our method is robust and is successful in detecting the first arrival time automatically.
Advisors/Committee Members: Kouri, Donald J. (advisor), Rao, Jagannatha R. (committee member), Ardebili, Haleh (committee member).
Subjects/Keywords: Super Gaussian Mu-Wavelets; First Break Detection; Spectral decomposition; Heisenberg Uncertainty Principle; Singular Value Decomposition Method; Cn transform
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APA (6th Edition):
Kapur, S. 1. (n.d.). Automatic First Break Detection by Spectral Decomposition Using Minimum Uncertainty Wavelets. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/2184
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Kapur, Sunil 1988-. “Automatic First Break Detection by Spectral Decomposition Using Minimum Uncertainty Wavelets.” Masters Thesis, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/2184.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Kapur, Sunil 1988-. “Automatic First Break Detection by Spectral Decomposition Using Minimum Uncertainty Wavelets.” Web. 24 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Kapur S1. Automatic First Break Detection by Spectral Decomposition Using Minimum Uncertainty Wavelets. [Internet] [Masters thesis]. University of Houston; [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/2184.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Kapur S1. Automatic First Break Detection by Spectral Decomposition Using Minimum Uncertainty Wavelets. [Masters Thesis]. University of Houston; Available from: http://hdl.handle.net/10657/2184
Note: this citation may be lacking information needed for this citation format:
No year of publication.
University of Houston
10.
Zamanian, Fatemeh.
Nonlinear Controller Design for Regulating Systems.
Degree: PhD, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/2830
► Presented in this dissertation is a nonlinear controller synthesis methodology based on the inverse Sinusoidal Input Describing Function (SIDF) for a class of regulating systems.…
(more)
▼ Presented in this dissertation is a nonlinear controller synthesis methodology based on the inverse Sinusoidal Input Describing Function (SIDF) for a class of regulating systems. The design goal is to improve regulating performance beyond what is achievable by a linear control for a predicted level of disturbance step size. The controller design is executed using open loop frequency domain information and is applicable when the frequency response of a linear design cannot satisfy the designed open loop gain and phase characteristics. The gain and phase differences between the designed open loop frequency response and that of a linear design is treated as SIDF distortions. The inverse describing function approach is employed to identify an isolated explicit nonlinearity that is associated with obtained gain and phase distortions.
For this, a computational solution to the inverse SIDF for a broad class of hysteresis or memoryless explicit nonlinearities is developed. The proposed numerical solution uses gain and phase distortions as a function of input amplitude size to identify the nonlinearity, and does not require a priori knowledge of the nonlinearity in the estimation process. The output from the algorithm is a non-parametric model of the nonlinearity from which a parametric model can be recovered.
To illustrate the proposed nonlinear controller design technique, the idle speed control of a V-6 fuel injected engine model subject to an external torque load disturbance is considered. The closed loop performance is validated through simulation and the closed loop stability in the sense of the bounded-input-bounded-output (BIBO) is assessed using Circle Theorem.
Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Rao, Jagannatha R. (committee member), Song, Gangbing (committee member), Provence, Robert S. (committee member).
Subjects/Keywords: Nonlinear Control; Frequency Domain; Inverse Sinusoidal Input Describing Function; H_∞ Linear Control Synthesis; BIBO Stability; Inverse Sinusoidal Input Describing Function; Gain distortions; Phase distortions; Memoryless Nonlinearities
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APA (6th Edition):
Zamanian, F. (n.d.). Nonlinear Controller Design for Regulating Systems. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/2830
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Chicago Manual of Style (16th Edition):
Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/2830.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
MLA Handbook (7th Edition):
Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Web. 24 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Zamanian F. Nonlinear Controller Design for Regulating Systems. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/2830.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Council of Science Editors:
Zamanian F. Nonlinear Controller Design for Regulating Systems. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/2830
Note: this citation may be lacking information needed for this citation format:
No year of publication.
University of Houston
11.
-2836-2615.
A Novel Approach to Robust Design Using Recent Advances in Robust and Multiobjective Optimization Methods.
Degree: PhD, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/2162
► Current advances in the fi eld of Robust Optimization (RO) from such authors as Azarm, Ben-Tal, Elishakoff , Zhang, Renaud and others have led to…
(more)
▼ Current advances in the fi eld of Robust Optimization (RO) from such authors as Azarm, Ben-Tal, Elishakoff , Zhang, Renaud and others have led to new and interesting approaches to the treatment of uncertainty in traditional engineering problems. This paper presents the Budget of Uncertainty (BoU) design method; a new method by which such approaches can be applied in a manner which balances the need for optimization with the desire for robust solutions.
Where previous work has focused on immunizing an optimization problem against pre-set uncertainty ranges, the BoU method adds additional design variables in an eff ort to solve for an appropriate uncertainty range. The BoU method simultaneously determines an optimum solution and an allowed uncertainty budget within a restricted feasibility space. The result is a solution that guarantees fi rst order satisfaction of uncertain constraints and provides a measure of problem sensitivity to its uncertain parameters. This provides additional insight to early problem development, and can potentially create alternatives to traditional approaches such as Monte Carlo analysis.
Within this work we will present a summary of current RO research and introduce the BoU method. We will then apply the BoU method to a simple 2D geometric problem to illustrate its application. Finally, we tackle two well-studied engineering design problems, the Golinksi Speed Reducer and the simple Helical Spring design problem to show a more realistic application of the new method.
Advisors/Committee Members: Rao, Jagannatha R. (advisor), Grigoriadis, Karolos M. (committee member), Song, Gangbing (committee member), Lim, Gino J. (committee member), Feng, Qianmei (committee member).
Subjects/Keywords: Multiobjective; Optimization; Goal programming; Uncertainty; Robust design
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APA (6th Edition):
-2836-2615. (n.d.). A Novel Approach to Robust Design Using Recent Advances in Robust and Multiobjective Optimization Methods. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/2162
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Chicago Manual of Style (16th Edition):
-2836-2615. “A Novel Approach to Robust Design Using Recent Advances in Robust and Multiobjective Optimization Methods.” Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/2162.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
MLA Handbook (7th Edition):
-2836-2615. “A Novel Approach to Robust Design Using Recent Advances in Robust and Multiobjective Optimization Methods.” Web. 24 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Vancouver:
-2836-2615. A Novel Approach to Robust Design Using Recent Advances in Robust and Multiobjective Optimization Methods. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/2162.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Council of Science Editors:
-2836-2615. A Novel Approach to Robust Design Using Recent Advances in Robust and Multiobjective Optimization Methods. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/2162
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
University of Houston
12.
-5348-995X.
Modeling for Cluster-Based Correlation of Safety Driving Events with Time and Location.
Degree: PhD, Mechanical Engineering, University of Houston
URL: http://hdl.handle.net/10657/2836
► Advanced driver assistance systems (ADAS) are general systems developed to enhance safety driving of an individual vehicle. In this dissertation, a type of ADAS, named…
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▼ Advanced driver assistance systems (ADAS) are general systems developed to enhance safety driving of an individual vehicle. In this dissertation, a type of ADAS, named safety driving assistance system, is proposed to lower the potential driving risk caused by severe driving events to enhance the safety driving of an individual vehicle. The safety driving assistance system identifies the severe driving events and the occurrence of the events to infrastructure, notifies the events temporal and spatial concentration and variation, and models the concentration and variation in form of the event count data time series modeling to evaluate and predict the potential driving risk.
Safety driving assistance system uses a designed intelligent analyzer which is a systematic procedure to identify severe driving events occurrence correlation with time and location. The proposed procedure, which is constructed based on batch clustering and real-time clustering techniques, incorporates historical and real-time data to recognize the time and location of severe driving events and simulate the variation of severe driving events distribution and concentration with respective to time and location, respectively. Batch clustering is implemented with the combination of subtractive clustering and fuzzy c-means clustering to generate clusters representing the initial correlation patterns. Real-time clustering is then developed to create and update real-time correlation patterns on the foundation of the batch clustering using evolving Gustafson-Kessel Like (eGKL) algorithm. Historical and real-time data of operating vehicles acquired from data acquisition and wireless communication platform (DAP), constructed by Ford Motor company, are used to validate the proposed strategy. Batch clustering reveals the severe driving events distribution and concentration in geographical domain at different time. Real-time clustering provides and updates the variation of the intra-correlation and inter-correlation of different regions. Driver can be notified of the potential severe driving locations through maps showing the driving routes. Through the variation of the correlation, drivers can recognize the events occurrence at different time and location.
The variation of the correlation can be presented by events count data time series. Four models are proposed to describe time series of event count data in a region and to predict the future event count in the region. ARIMA and STARIMA modeling procedures account more on the aspect of the time series autocorreation in temporal domain and spatial domain. Generalized linear model (GLM) with Poisson distribution accounts more on the aspect of the natural distribution property of severe driving event. Hidden Markov Model (HMM) is attempted to describe and predict the event count data in a deep reasoning that the stochastic process of severe driving event occurrence in different regions is generated from different Poisson distribution components following certain transition logic. The four models are…
Advisors/Committee Members: Grigoriadis, Karolos M. (advisor), Franchek, Matthew A. (committee member), Rao, Jagannatha R. (committee member), Song, Gangbing (committee member), Nikolaou, Michael (committee member).
Subjects/Keywords: Safety driving; Correlation identification and modeling; Clustering; Time series modeling; Hidden Markov model
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
-5348-995X. (n.d.). Modeling for Cluster-Based Correlation of Safety Driving Events with Time and Location. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/2836
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Chicago Manual of Style (16th Edition):
-5348-995X. “Modeling for Cluster-Based Correlation of Safety Driving Events with Time and Location.” Doctoral Dissertation, University of Houston. Accessed January 24, 2021.
http://hdl.handle.net/10657/2836.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
MLA Handbook (7th Edition):
-5348-995X. “Modeling for Cluster-Based Correlation of Safety Driving Events with Time and Location.” Web. 24 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Vancouver:
-5348-995X. Modeling for Cluster-Based Correlation of Safety Driving Events with Time and Location. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 24].
Available from: http://hdl.handle.net/10657/2836.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
Council of Science Editors:
-5348-995X. Modeling for Cluster-Based Correlation of Safety Driving Events with Time and Location. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/2836
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
No year of publication.
. 
Open Access Theses and Dissertations
